PC turning back on after shutdown?

MarkdaSpark

MarkdaSpark

MarkdaSpark

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Joined
29 Dec 2012
Posts
13
Location
Wiltshire
Hi Guys,
I would really appreciate some advice with this spooky issue I have with my PC.
Now and then after shutting down it turns its self back on.
It happens at random times, sometimes straight away and other times maybe 5-10 minutes later. Its in a different room so I never know how long its been on for. It has been found on in the morning having been shutdown the evening before?
It all works fine, no shutdowns while using so I'm really puzzled by it.
Thanks
Mark
 
Are you using sleep modes, or completely shutting down?

If using sleep/hibernate:
Go into device manager and for each USB device go to the Power Management tab. Make sure "Allow this device to wake the computer" is unticked, especially for mice and keyboards. Also do the same your network port.

If running Windows 8 or later, search for "Change Automatic Maintenance settings", then disable "allow scheduled maintenance to wake the computer".

If the issue persists, open an administrative command prompt and type the following which will tell you what woke the computer.
powercfg -lastwake <enter>

The windows event logs can also give you an idea of what time the computer woke, and sometimes why too.

If shutting down:
Check in your bios that no wake events are set.
 
Thank you for the speedy response. I've checked BIOS power settings and it is off on power fail. There is no wake on LAN option. I have unticked allow scheduled maintenance. Gonna see what happens now.
Thanks
 
no, its still doing it. did it again tonight, selected shut down, it goes through its thing then shuts down. sometime later it restarts without any input. I tried the cfg command as suggested but the dos screen quickly disappears so unable to read it.
checked event log but I'm not sure what I'm looking for.
 
In order to read the dos screen, you need to launch and administrative command prompt then run the command. If you have Windows 8.1 or later right click on the Windows icon, select Command Prompt (admin), then type the command into the box.

As for the event logs, go into the Windows logs section and select system. Check the events are ordered by date/time, then look at the first few events from after the time you shut the computer down. There's no guarantee there'll be useful information, but worth a try.

It might also be worth checking what your BIOS's doesn't have any other wake events set, e.g. on time, event etc.
 
Hi guys, thanks again for the advice. having had it start up again on its own at some point last night, I had another look at the things recommended.
BIOS setting said something like lan wake on PXE? I've disabled it anyway.
I'll keep you posted.
 
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